CN108494995A - A kind of passive filter device - Google Patents
A kind of passive filter device Download PDFInfo
- Publication number
- CN108494995A CN108494995A CN201810315461.6A CN201810315461A CN108494995A CN 108494995 A CN108494995 A CN 108494995A CN 201810315461 A CN201810315461 A CN 201810315461A CN 108494995 A CN108494995 A CN 108494995A
- Authority
- CN
- China
- Prior art keywords
- signal
- passive filter
- broadband passive
- helical antenna
- cable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
- H04N5/213—Circuitry for suppressing or minimising impulsive noise
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Filters And Equalizers (AREA)
Abstract
The present invention discloses a kind of passive filter device.The device includes：Broadband passive filter and helical antenna；The signal input part of broadband passive filter and cable TV connects, and broadband passive filter is used for the operation to executing attenuation filter along signal wire reverse transfer TV signal；After reverse transfer TV signal is by broadband passive filter, reverse transfer TV signal can be attenuated 60db, helical antenna is connect with the broadband passive filter, helical antenna is arranged in external environment, helical antenna is used to receive the noise signal in the external environment, and noise signal is superimposed with the reversed TV signal of decaying and is sent to TV signal group cable.Pass through broadband passive filter and the helical antenna collective effect, the broadband passive filter is used to execute the cable TV signal of input the operation of attenuation filter, it realizes while ensure that the cable television normally watches program, reverse signal transmission is blocked, the effect for preventing leakage of information is realized.
Description
Technical field
The present invention relates to field of information security technology, more particularly to a kind of passive filter device.
Background technology
With the development of information age and network times, DTV has high-resolution, low energy consumption, vdiverse in function and guarantor
The good advantage of close property.
Information interception on the signal wire of system for TV set is the important channel of system leak.Due to both at home and abroad to mutually powered-down
Depending on machine system secrecy provision be only limited to TV signal itself, thus be diverted through signal wire conduction or space radiation
Mode obtain information technology it is fast-developing.Therefore, system for TV set information security has been one very urgent great
Problem, the relevant department of many countries and regions all expand the research and development of this work.
Under the support of Commission of Science, Technology and Industry for National Defence, China low radiation computer, television set development, radiate relevant criterion system
Fixed, leakage shielding material exploitation etc. achieves significant development.Passive electromangnetic spectrum is due to simple in structure, no
It can cause electromagnetic pollution and be widely used.By using by intermetallic composite coating box with good conductivity, plate as shield, to
Electromagenetic wave radiation is confined to a determining region, but for television set, due to signal wire need of work, can be worn
All shields are crossed, thus will appear the possibility of leakage.
Either with shielding or without the coaxial signal line of shielding, radiation information and conducts information can be along shielded layers
Or the conduction of coaxial signal conducting wire, therefore, shielding measure in the prior art is unable to reach the physical isolation of information, and there is an urgent need for a kind of energy
The device for enough inhibiting television information to be conducted along signal wire.
Invention content
The object of the present invention is to provide a kind of passive filter devices that television information can be inhibited to be conducted along signal wire.
To achieve the above object, the present invention provides following schemes：
A kind of passive filter device, described device are applied to cable television, and described device includes：Broadband passive filter
And helical antenna；
The broadband passive filter is connect with the signal input part of the cable TV, the broadband passive filter
Operation for executing attenuation filter to the cable TV signal of input；
The helical antenna is connect with the broadband passive filter, and the helical antenna is arranged in external environment, institute
Helical antenna is stated for receiving the noise signal in the external environment, and the noise signal is sent to the broadband passive
Filter.
Optionally, the broadband passive filter is to the without hindrance effect of positive transmitting television signals；
To along signal wire reverse transfer TV signal, after the reverse transfer TV signal is by broadband passive filter,
The reverse transfer TV signal can be attenuated 60db, and the TV signal of the reverse transfer after decaying connects with the helical antenna
The noise signal of receipts is superimposed and is sent on TV signal group cable；
The forward direction transmitting television signals are the signal for being transferred to the cable television, and the reverse transmission signal is described
The signal of television set output.
According to specific embodiment provided by the invention, the invention discloses following technique effects：One kind provided by the invention
Passive filter device, by broadband passive filter and the helical antenna collective effect, the broadband passive filter is used
In the operation for executing attenuation filter to the cable TV signal of input, realizes and ensure that the cable television normally watches program
Meanwhile reverse signal transmission is blocked, during reverse transfer, by the broadband passive filter, decaying reaches 60dB
More than, the noise interferences then received with helical antenna are superimposed, and the information through the broadband passive filter attenuation is by spiral shell
It revolves the spatial noise interference signal that antenna receives to fall into oblivion, realizes the effect for preventing leakage of information.
Description of the drawings
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the present invention
Example, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of structure chart of passive filter device provided by the invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of passive filter devices that television information can be inhibited to be conducted along signal wire.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is described in further detail.
As shown in Figure 1, a kind of passive filter device, described device is applied to cable television 1, and described device includes：It is wide
Band passive filter 2 and helical antenna 3；
The broadband passive filter 2 is connect with the signal input part of the cable TV 1, the broadband passive filtering
Device 2 is used to execute the cable TV signal of input the operation of attenuation filter；
The helical antenna 3 is connect with the broadband passive filter 2, and the helical antenna 3 is arranged in external environment,
The helical antenna 3 is used to receive the noise signal in the external environment, and the noise signal is sent to the broadband
Passive filter 2.
As shown in Figure 1, the broadband passive filter is to the without hindrance effect of positive transmitting television signals；
To along signal wire reverse transfer TV signal, after the reverse transfer TV signal is by broadband passive filter,
The reverse transfer TV signal can be attenuated 60db, and the TV signal of the reverse transfer after decaying connects with the helical antenna
The noise signal of receipts is superimposed and is sent on TV signal group cable；
The forward direction transmitting television signals are the signal for being transferred to the cable television, and the reverse transmission signal is described
The signal of television set output.
The specific course of work of the passive filter device：
For the forward conduction mode of the cable television 1
For positive transmission line, the noise signal of the external environment that the helical antenna 3 receives can be superimposed into described
Noise interferences are carried out attenuation filter by broadband passive filter 2, the broadband passive filter 2, are made it not and are influenced and is described
Cable TV 1 works normally.
For the reverse conduction mode of the cable television 1
For backward transmission line, the video information of the cable TV 1 concentrates on low-frequency range, is transmitted on signal wire
Information along signal wire conduction transmission, by the broadband passive filter 2, decaying is more than 60dB, obtains deamplification, described
Deamplification is superimposed with the noise interferences that the helical antenna 3 receives, and the deamplification is connect by the helical antenna 3
The noise interferences of the external environment received are fallen into oblivion, to prevent the leakage of video information.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.
Principle and implementation of the present invention are described for specific case used herein, and above example is said
The bright method and its core concept for being merely used to help understand the present invention；Meanwhile for those of ordinary skill in the art, foundation
The thought of the present invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (2)
1. a kind of passive filter device, which is characterized in that described device is applied to cable television, and described device includes：Broadband
Passive filter and helical antenna；
The broadband passive filter is connect with the signal input part of the cable TV, and the broadband passive filter is used for
The operation of attenuation filter is executed to the cable TV signal of input；
The helical antenna is connect with the broadband passive filter, and the helical antenna is arranged in external environment, the spiral shell
Rotation antenna is used to receive the noise signal in the external environment, and the noise signal is sent to the broadband passive and is filtered
Device.
2. a kind of passive filter device according to claim 1, which is characterized in that the broadband passive filter is to just
To the without hindrance effect of transmitting television signals；
It is described after the reverse transfer TV signal is by broadband passive filter to along signal wire reverse transfer TV signal
Reverse transfer TV signal can be attenuated 60db, and the TV signal of the reverse transfer after decaying is received with the helical antenna
Noise signal is superimposed and is sent on TV signal group cable；
The forward direction transmitting television signals are the signal for being transferred to the cable television, and the reverse transmission signal is the TV
The signal of machine output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810315461.6A CN108494995B (en) | 2018-04-10 | 2018-04-10 | A kind of passive filter device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810315461.6A CN108494995B (en) | 2018-04-10 | 2018-04-10 | A kind of passive filter device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108494995A true CN108494995A (en) | 2018-09-04 |
| CN108494995B CN108494995B (en) | 2019-07-19 |
Family
ID=63315334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810315461.6A Expired - Fee Related CN108494995B (en) | 2018-04-10 | 2018-04-10 | A kind of passive filter device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108494995B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1110495A (en) * | 1993-05-28 | 1995-10-18 | 美国韦斯特技术有限公司 | Method and apparatus for delivering secured telephony service in a hybrid coaxial cable network |
| JPH10242713A (en) * | 1997-02-27 | 1998-09-11 | Hitachi Metals Ltd | Connection structure between non-reversible circuit element and circuit board |
| CN105007578A (en) * | 2015-06-05 | 2015-10-28 | 西安交通大学 | Uplink secure transmission method based on downlink auxiliary feedback in 5G communication system |
| CN106162033A (en) * | 2015-04-09 | 2016-11-23 | 长春理工大学 | Video signal reversely ends transmission equipment |
-
2018
- 2018-04-10 CN CN201810315461.6A patent/CN108494995B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1110495A (en) * | 1993-05-28 | 1995-10-18 | 美国韦斯特技术有限公司 | Method and apparatus for delivering secured telephony service in a hybrid coaxial cable network |
| JPH10242713A (en) * | 1997-02-27 | 1998-09-11 | Hitachi Metals Ltd | Connection structure between non-reversible circuit element and circuit board |
| CN106162033A (en) * | 2015-04-09 | 2016-11-23 | 长春理工大学 | Video signal reversely ends transmission equipment |
| CN105007578A (en) * | 2015-06-05 | 2015-10-28 | 西安交通大学 | Uplink secure transmission method based on downlink auxiliary feedback in 5G communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108494995B (en) | 2019-07-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190719 |